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09 Big Muddy 500 Top end problems

I'm having issues with my ride topping out around 26mph/4krpm. I've been doing a lot of research online and I believe it should be topping out around 40 mph? I've pulled and fully cleaned the carb which wasn't that dirty. Changed plug (shows signs of running rich) dark and wet with gas. Checked spark with inline spark tester which is great until about 4k rpms and flickers with the sputtering. Air filter is good. Muffler is good. Sounds, runs and drives great up until +/- 26mph/4k rpms. Then spits and sputters. Any advice would be highly appreciated.
Thanks,
Joe

Thanks. There was a bad connection at the coil. Looks like the previous owner might have had some hodgepodge work done on it. Bad news is it didn't fix the problem. I started over and went back through everything I already did just to make sure I didn't miss anything. Got to carburetor again and upon further inspection looks like I need a rebuild kit.